15米翼展太阳能飞机机翼颤振分析和刚度设计

太阳能飞机小刚度和大变形的特点导致其普遍存在颤振问题,因此有必要合理建立太阳能飞机的动力学模型并进行颤振分析。以国内某15米翼展太阳能飞机为研究对象,建立初始的动力学模型,然后根据目标颤振速度调节模型刚度,得到了与目标颤振速度匹配的机翼主梁刚度,从而实现太阳能飞机的动力学反向建模,并在此基础上进行颤振分析,形成完整的太阳能飞机颤振分析设计方法。结果表明:该机翼扭转刚度增大70%,其颤振速度可提高29%。本文方法可用于指导15米太阳能飞机的防颤振设计。

RESEARCH OF FLUTTER CHARACTERISTICS AND STIFFNESS DESIGNFOR 15 METERS SPAN WING OF A SOLAR-POWERED AIRCRAFT

Flutter widely happens on solar-powered aircrafts due to the slight stiffness and large deformation, so that it is significant to establish the dynamic model of solar-powered aircrafts and analyze the flutter characteristics. Based on an initial dynamic model of a 15 meters span solar-powered aircraft is firstly build, the reverse modeling is implemented by optimize the model stiffness according to the objective flutter speed. Then the flutter analysis is carried out and a complete method for flutter analysis of solar-powered aircrafts is developed. Utilizing this method for reverse modeling and flutter analysis of a long straight wing of a solar-powered aircraft, the wing spar stiffness is estimated according to the flutter speed object. In addition, it is shown that the flutter speed will increase by 29% as the wing torsional stiffness increases by 70%. The present method can be used for wing structure design of the 15 meters span solar-powered aircraft.